refactor: simplify auth and subscription links

internal/database/migrations/0002_compatibility_resources.sql

@@ -1,25 +1,7 @@
 -- +goose Up
-CREATE TABLE IF NOT EXISTS download_grants (
-  id TEXT PRIMARY KEY,
-  token_hash TEXT NOT NULL UNIQUE,
-  resource_type TEXT NOT NULL CHECK (resource_type IN ('source', 'collection')),
-  resource_id TEXT NOT NULL,
-  target TEXT NOT NULL DEFAULT '',
-  expires_at INTEGER,
-  enabled INTEGER NOT NULL DEFAULT 1,
-  created_at INTEGER NOT NULL,
-  updated_at INTEGER NOT NULL
-);
-
-CREATE INDEX IF NOT EXISTS idx_download_grants_token_hash
-ON download_grants(token_hash);
-
-CREATE INDEX IF NOT EXISTS idx_download_grants_resource
-ON download_grants(resource_type, resource_id);
-
 CREATE TABLE IF NOT EXISTS recycle_bin (
   id TEXT PRIMARY KEY,
-  resource_type TEXT NOT NULL CHECK (resource_type IN ('source', 'collection', 'template', 'share')),
+  resource_type TEXT NOT NULL CHECK (resource_type IN ('source', 'collection', 'template')),
   resource_id TEXT NOT NULL,
   snapshot_json TEXT NOT NULL,
   deleted_at INTEGER NOT NULL